处理Sql查询遇到这样一个问题（数据库是MySQL），有个字段定义类型是datetime，且非空无默认值，

通过PHPMyAdmin界面填充测试数据的时候没有理会这个字段，看到个小警告，插入成功，

但是在取数据的时候出现这样一个错误：

Value '0000-00-00 00:00:00' can not be represented asjava.sql.Timestamp

因为数据库访问层是自己封装的架构，所以第一个想法是：“哇，遇到一个新情况”，

于是去看基类的反射处理部分，好像没啥问题，小小的失望了一下，

后来把整个错误扔到网上搜索了一下，嗬，还真不少，中文的英文的××文的都有，

捡个权威的吧（MySQL官方http://dev.mysql.com/doc/refman/5.1/en/connector-j-installing-upgrading.html）：

Datetimes withall-zero components (0000-00-00 ...) — These values can not berepresented reliably in Java. Connector/J 3.0.x always convertedthem to NULL when being read from a ResultSet.

Connector/J 3.1 throws an exception by default when thesevalues are encountered as this is the most correct behavioraccording to the JDBC and SQL standards. This behavior can bemodified using the zeroDateTimeBehavior configurationproperty. The allowable values are:

Starting with Connector/J 3.1.7, ResultSet.getString() can bedecoupled from this behavior via noDatetimeStringSync=true (thedefault value is false) so that you can retrieve the unalteredall-zero value as a String. It should be noted that this alsoprecludes using any time zone conversions, therefore the driverwill not allow you to enable noDatetimeStringSync and useTimezone atthe same time.

两种解决办法（高亮颜色我加的），两种方法都是在数据库连接串处追加设置，

现举例说下两种情况的结果：

原连接串：driver-url=jdbc:mysql://127.0.0.1/test

使用参数zeroDateTimeBehavior：

取值exception：

driver-url=jdbc:mysql://127.0.0.1/test?zeroDateTimeBehavior=exception

结果：

java.sql.SQLException:Value '0000-00-00 00:00:00' can not be represented asjava.sql.Timestamp

取值convertToNull：

driver-url=jdbc:mysql://127.0.0.1/test?zeroDateTimeBehavior=convertToNull

结果：

ClientDto[id:1,email:test@hotmail.com,civilite:测试用户,prenom:贾,nom:某某,birthday:1992-03-18,telephone:12312345678,address:测试用户的住址,regionid:1,postcode:111000,city:大连,country:france,batiment:110#,escalier:2,code:151515,interphone:050505,etage:东侧走廊,appartment:205,createdate:2010-03-1609:30:21.0,status:0,totalprice:0.00,totalnum:0,lastdate:null,lasttotal:0.00,]

取值round：

driver-url=jdbc:mysql://127.0.0.1/test?zeroDateTimeBehavior=round

结果：

ClientDto[id:1,email:test@hotmail.com,civilite:测试用户,prenom:贾,nom:某某,birthday:1992-03-18,telephone:12312345678,address:测试用户的住址,regionid:1,postcode:111000,city:大连,country:france,batiment:110#,escalier:2,code:151515,interphone:050505,etage:东侧走廊,appartment:205,createdate:2010-03-1609:30:21.0,status:0,totalprice:0.00,totalnum:0,lastdate:0001-01-0100:00:00.0,lasttotal:0.00,]

另一参数noDatetimeStringSync：

driver-url=jdbc:mysql://127.0.0.1/test?noDatetimeStringSync=true

结果：

ClientDto[id:1,email:test@hotmail.com,civilite:测试用户,prenom:贾,nom:某某,birthday:1992-03-18,telephone:12312345678,address:测试用户的住址,regionid:1,postcode:111000,city:大连,country:france,batiment:110#,escalier:2,code:151515,interphone:050505,etage:东侧走廊,appartment:205,createdate:2010-03-1609:30:21,status:0,totalprice:0.00,totalnum:0,lastdate:0000-00-0000:00:00,lasttotal:0.00,]

个人感觉按通用性来说结果是Null可能好些，但是结果是一串零的更能贴近空时间的概念，所以具体选择看各自项目的需求选择使用吧。

原文转自：http://blog.sina.com.cn/s/blog_5fbb09180100u6xb.html，所有权力归原作者所有。